V belts are NOT measured by diameter nor folding the v belt in half. The most accurate way to measure the circumference of a v belt is with a v belt measuring tool or using a cloth tape measure (Not a steel tape measure or ruler). An additional option is to wrap a small diameter string/rope around the v belt, then measure the length of the string. When measuring be sure to have the v belt under slight tension and the cloth tape measure is tightly against the back of the v belt. Also, keep in mind v belts do stretch and unfortunately there is no specific value for how much a v belt can stretch. You’ll also need to measure the width and depth to determine which section v belt you have.

How to determine the v belt number

All A,B,C,D,E,AX,BX belts list the inside circumference measurement after the letter of the v belt part number. Example: A88 has a 88″ inner circumference, then you add 2 inches for the A Section (Listed below) to obtain the outer circumference. If you measure the outer circumference, then you would subtract the number of inches based on the section you have (Listed below) to obtain the v belt number. This is also the same for the banded belts. Measure each individual band for banded v belts to obtain the correct width.

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